<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div id="test"></div>
  <!-- 引入react核心库 -->
  <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
  <!-- 用于支持react操作DOM -->
  <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
  <!-- 用于将jsx转为js -->
  <script src="https://unpkg.com/babel-standalone@6/babel.min.js"></script>
  
  <script type="text/babel">
    class Weather extends React.Component{
      //初始化状态
      state={isHot:false,wind:'微风'};

      render(){
        const {isHot,wind}=this.state;
        return <h1 onClick={this.changeWeather}>今天天气很{isHot? '炎热':'凉爽'},{wind}</h1>
      }
      //自定义方法--要用赋值语句形式+箭头函数
      changeWeather=()=>{
        const isHot=this.state.isHot;
        this.setState({isHot:!isHot});
      }
    }
    ReactDOM.render(<Weather/>,document.getElementById('test'))
  </script>
</body>
</html>